Converter steel-tapping hole pumping and casting repair equipment and casting repair method

Abstract

The invention provides converter steel-tapping hole pumping and casting repair equipment and a casting repair method, and belongs to the technical fields of construction of fireresistant artesian casting material construction and equipment. The converter steel-tapping hole pumping and casting repair equipment is characterized in that a support frame is fixed to a delivery platform, wherein a material storing device is fixed to the support frame, and is connected with a feed opening of a pumping device through a conveying device, a discharge opening of the pumping device communicates with a heat insulating chute through a discharge pipe, and a material conveying device and the pumping device are both fixed to the delivery platform; and a high pressure gas source also communicates with the material conveying device through a high pressure gas pipe. Through hot-state artesian performance of a casting material, the casting material can be conveyed into a converter through a heat insulatingchute, and cast into tiny cracks between the periphery of casing pipe bricks and steel-tapping hole big bricks, and surplus heat of a backup lining brick is used for sintering. In the artesian process of the casting material, a liquid binder is added, wherein the casting machine is a magnesium artesian casting material, and main raw materials are sintered magnesia and fused magnesia. Efficient dispersing agents of explosion-proof fiber and polyocarboxy acid are added, and silicon dioxide micro powder, graphite or carbon black powder are compounded.

Description

technical field [0001] The invention relates to the technical field of refractory self-flowing castable construction and equipment, in particular to pumping pouring repair equipment and a pouring repair method for a taphole of a converter. Background technique [0002] The integrity of the tap hole of the converter directly controls the amount of slag lowered by the converter, and has a direct impact on the alloy yield and subsequent processing (LF, RH, etc.) For converters, the related repair technology of the steel outlet is placed in a very important position. The refractory repair materials mainly include traditional dry gunning materials and magnesium-chromium castables. And the magnesia-chrome castable has also gradually developed from the original traditional cement bond to ultra-low cement or even no cement bond. Corresponding to the development of ultra-fine powder technology and water reducer technology, the castable for replacement and repair of the tap hole is al...

AI Technical Summary

Problems solved by technology

[0003] Due to the addition of low-melting point inorganic salts and the uncertainty of the amount of water added in dry gunning material repair, the mixing time of materials and water is short and uneven, and the material structure is loose, resulting in air gaps and low strength; in addition, due to the particle size of dry gunning material Thin and poor spalling resistance, resulting in short service life of the tap hole and difficult to meet the requirements of the converter

Therefore, at present, more magnesium-chromium castables are used on site to solve the air gap around the tap hole casing and slow down the damage speed of the tap hole. However, due to the limitation of converter hot repair construction conditions, manual Use a shovel to stir, then push it to the back of the furnace with a small cart, and then use the manual turning method to put the castable into the furnace; limited by the influence of the residual temperature of the furnace lining on site and the inaccuracy caused by long-distance throwing construction, resulting in The pouring material cannot completely and accurately enter the gap between the taphole bushing and the seat brick, and the site needs to use the tap water pipe to flush the material to assist, which will not only cause damage to the hot brick lining, but also cause After sintering, the castable has many pores and poor compactness, which leads to intolerant to slag erosion, low strength, and short service life; at the same time, a certain amount of chromium oxide contained in the material seriously pollutes the on-site workshop environment and affects the health of the workers in the steel plant. very bad influence

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